I missed the last train and ended up staying at my junior's house... I was soaked by the heavy rain that I couldn't resist the temptation of her athlete's body and ended up having an affair and cumming inside her many times until the morning. Hibiki Amemiya

The movie depicts a scenario where the narrator, a older male, misses the last train due to heavy rain and ends up staying at his junior's house, leading to a romantic and intimate encounter. The relationship between the two main participants is that of a senior and junior, with the narrator being the older and more experienced one. The central dramatic tension arises from the unexpected turn of events and the exploration of their desires and boundaries.